#include "NotificationChecker.h"

#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QDebug>

#include "Env.h"
#include "net/Download.h"


NotificationChecker::NotificationChecker(QObject *parent)
	: QObject(parent)
{
}

void NotificationChecker::setNotificationsUrl(const QUrl &notificationsUrl)
{
	m_notificationsUrl = notificationsUrl;
}

void NotificationChecker::setApplicationChannel(QString channel)
{
	m_appVersionChannel = channel;
}

void NotificationChecker::setApplicationFullVersion(QString version)
{
	m_appFullVersion = version;
}

void NotificationChecker::setApplicationPlatform(QString platform)
{
	m_appPlatform = platform;
}

QList<NotificationChecker::NotificationEntry> NotificationChecker::notificationEntries() const
{
	return m_entries;
}

void NotificationChecker::checkForNotifications()
{
	if (!m_notificationsUrl.isValid())
	{
		qCritical() << "Failed to check for notifications. No notifications URL set."
					 << "If you'd like to use MultiMC's notification system, please pass the "
						"URL to CMake at compile time.";
		return;
	}
	if (m_checkJob)
	{
		return;
	}
	m_checkJob.reset(new NetJob("Checking for notifications"));
	auto entry = ENV.metacache()->resolveEntry("root", "notifications.json");
	entry->setStale(true);
	m_checkJob->addNetAction(m_download = Net::Download::makeCached(m_notificationsUrl, entry));
	connect(m_download.get(), &Net::Download::succeeded, this, &NotificationChecker::downloadSucceeded);
	m_checkJob->start();
}

void NotificationChecker::downloadSucceeded(int)
{
	m_entries.clear();

	QFile file(m_download->getTargetFilepath());
	if (file.open(QFile::ReadOnly))
	{
		QJsonArray root = QJsonDocument::fromJson(file.readAll()).array();
		for (auto it = root.begin(); it != root.end(); ++it)
		{
			QJsonObject obj = (*it).toObject();
			NotificationEntry entry;
			entry.id = obj.value("id").toDouble();
			entry.message = obj.value("message").toString();
			entry.channel = obj.value("channel").toString();
			entry.platform = obj.value("platform").toString();
			entry.from = obj.value("from").toString();
			entry.to = obj.value("to").toString();
			const QString type = obj.value("type").toString("critical");
			if (type == "critical")
			{
				entry.type = NotificationEntry::Critical;
			}
			else if (type == "warning")
			{
				entry.type = NotificationEntry::Warning;
			}
			else if (type == "information")
			{
				entry.type = NotificationEntry::Information;
			}
			if(entryApplies(entry))
				m_entries.append(entry);
		}
	}

	m_checkJob.reset();

	emit notificationCheckFinished();
}

bool versionLessThan(const QString &v1, const QString &v2)
{
	QStringList l1 = v1.split('.');
	QStringList l2 = v2.split('.');
	while (!l1.isEmpty() && !l2.isEmpty())
	{
		int one = l1.isEmpty() ? 0 : l1.takeFirst().toInt();
		int two = l2.isEmpty() ? 0 : l2.takeFirst().toInt();
		if (one != two)
		{
			return one < two;
		}
	}
	return false;
}

bool NotificationChecker::entryApplies(const NotificationChecker::NotificationEntry& entry) const
{
	bool channelApplies = entry.channel.isEmpty() || entry.channel == m_appVersionChannel;
	bool platformApplies = entry.platform.isEmpty() || entry.platform == m_appPlatform;
	bool fromApplies =
		entry.from.isEmpty() || entry.from == m_appFullVersion || !versionLessThan(m_appFullVersion, entry.from);
	bool toApplies =
		entry.to.isEmpty() || entry.to == m_appFullVersion || !versionLessThan(entry.to, m_appFullVersion);
	return channelApplies && platformApplies && fromApplies && toApplies;
}